peopledetect.py sample added (TODO: use builtin svm data instead of people_hog.txt)

some old cv api use cleaning

samples/python2/lk_track.py

@@ -1,6 +1,5 @@
 import numpy as np
 import cv2
-import cv2.cv as cv
 import video
 from common import anorm2, draw_str
 from time import clock